| 1 | /* Header for multilingual character handler. |
| 2 | Copyright (C) 1995, 1997, 1998 Electrotechnical Laboratory, JAPAN. |
| 3 | Licensed to the Free Software Foundation. |
| 4 | |
| 5 | This file is part of GNU Emacs. |
| 6 | |
| 7 | GNU Emacs is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 2, or (at your option) |
| 10 | any later version. |
| 11 | |
| 12 | GNU Emacs is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with GNU Emacs; see the file COPYING. If not, write to |
| 19 | the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| 20 | Boston, MA 02111-1307, USA. */ |
| 21 | |
| 22 | #ifndef _CHARSET_H |
| 23 | #define _CHARSET_H |
| 24 | |
| 25 | /*** GENERAL NOTE on CHARACTER SET (CHARSET) *** |
| 26 | |
| 27 | A character set ("charset" hereafter) is a meaningful collection |
| 28 | (i.e. language, culture, functionality, etc) of characters. Emacs |
| 29 | handles multiple charsets at once. Each charset corresponds to one |
| 30 | of ISO charsets (except for a special charset for composition |
| 31 | characters). Emacs identifies a charset by a unique identification |
| 32 | number, whereas ISO identifies a charset by a triplet of DIMENSION, |
| 33 | CHARS and FINAL-CHAR. So, hereafter, just saying "charset" means an |
| 34 | identification number (integer value). |
| 35 | |
| 36 | The value range of charset is 0x00, 0x80..0xFE. There are four |
| 37 | kinds of charset depending on DIMENSION (1 or 2) and CHARS (94 or |
| 38 | 96). For instance, a charset of DIMENSION2_CHARS94 contains 94x94 |
| 39 | |
| 40 | |
| 41 | Within Emacs Lisp, a charset is treated as a symbol which has a |
| 42 | property `charset'. The property value is a vector containing |
| 43 | various information about the charset. For readability of C codes, |
| 44 | we use the following convention on C variable names: |
| 45 | charset_symbol: Emacs Lisp symbol of a charset |
| 46 | charset_id: Emacs Lisp integer of an identification number of a charset |
| 47 | charset: C integer of an identification number of a charset |
| 48 | |
| 49 | Each charset (except for ASCII) is assigned a base leading-code |
| 50 | (range 0x80..0x9D). In addition, a charset of greater than 0xA0 |
| 51 | (whose base leading-code is 0x9A..0x9D) is assigned an extended |
| 52 | leading-code (range 0xA0..0xFE). In this case, each base |
| 53 | leading-code specify the allowable range of extended leading-code as |
| 54 | shown in the table below. A leading-code is used to represent a |
| 55 | character in Emacs' buffer and string. |
| 56 | |
| 57 | We call a charset which has extended leading-code as "private |
| 58 | charset" because those are mainly for a charset which is not |
| 59 | registered by ISO. On the contrary, we call a charset which does |
| 60 | not have extended leading-code as "official charset". |
| 61 | |
| 62 | --------------------------------------------------------------------------- |
| 63 | charset dimension base leading-code extended leading-code |
| 64 | --------------------------------------------------------------------------- |
| 65 | 0x00 official dim1 -- none -- -- none -- |
| 66 | (ASCII) |
| 67 | 0x01..0x7F --never used-- |
| 68 | 0x80 COMPOSITION same as charset -- none -- |
| 69 | 0x81..0x8F official dim1 same as charset -- none -- |
| 70 | 0x90..0x99 official dim2 same as charset -- none -- |
| 71 | 0x9A..0x9F --never used-- |
| 72 | 0xA0..0xDF private dim1 0x9A same as charset |
| 73 | of 1-column width |
| 74 | 0xE0..0xEF private dim1 0x9B same as charset |
| 75 | of 2-column width |
| 76 | 0xF0..0xF4 private dim2 0x9C same as charset |
| 77 | of 1-column width |
| 78 | 0xF5..0xFE private dim2 0x9D same as charset |
| 79 | of 2-column width |
| 80 | 0xFF --never used-- |
| 81 | --------------------------------------------------------------------------- |
| 82 | |
| 83 | In the table, "COMPOSITION" means a charset for a composite |
| 84 | character which is a character composed from several (up to 16) |
| 85 | non-composite characters (components). Although a composite |
| 86 | character can contain components of many charsets, a composite |
| 87 | character itself belongs to the charset CHARSET-COMPOSITION. See |
| 88 | the document "GENERAL NOTE on COMPOSITE CHARACTER" below for more |
| 89 | detail. |
| 90 | |
| 91 | */ |
| 92 | |
| 93 | /* Definition of special leading-codes. */ |
| 94 | /* Base leading-code. */ |
| 95 | /* Special leading-code followed by components of a composite character. */ |
| 96 | #define LEADING_CODE_COMPOSITION 0x80 |
| 97 | /* Leading-code followed by extended leading-code. */ |
| 98 | #define LEADING_CODE_PRIVATE_11 0x9A /* for private DIMENSION1 of 1-column */ |
| 99 | #define LEADING_CODE_PRIVATE_12 0x9B /* for private DIMENSION1 of 2-column */ |
| 100 | #define LEADING_CODE_PRIVATE_21 0x9C /* for private DIMENSION2 of 1-column */ |
| 101 | #define LEADING_CODE_PRIVATE_22 0x9D /* for private DIMENSION2 of 2-column */ |
| 102 | |
| 103 | /* Extended leading-code. */ |
| 104 | /* Start of each extended leading-codes. */ |
| 105 | #define LEADING_CODE_EXT_11 0xA0 /* follows LEADING_CODE_PRIVATE_11 */ |
| 106 | #define LEADING_CODE_EXT_12 0xE0 /* follows LEADING_CODE_PRIVATE_12 */ |
| 107 | #define LEADING_CODE_EXT_21 0xF0 /* follows LEADING_CODE_PRIVATE_21 */ |
| 108 | #define LEADING_CODE_EXT_22 0xF5 /* follows LEADING_CODE_PRIVATE_22 */ |
| 109 | /* Maximum value of extended leading-codes. */ |
| 110 | #define LEADING_CODE_EXT_MAX 0xFE |
| 111 | |
| 112 | /* Definition of minimum/maximum charset of each DIMENSION. */ |
| 113 | #define MIN_CHARSET_OFFICIAL_DIMENSION1 0x81 |
| 114 | #define MAX_CHARSET_OFFICIAL_DIMENSION1 0x8F |
| 115 | #define MIN_CHARSET_OFFICIAL_DIMENSION2 0x90 |
| 116 | #define MAX_CHARSET_OFFICIAL_DIMENSION2 0x99 |
| 117 | #define MIN_CHARSET_PRIVATE_DIMENSION1 LEADING_CODE_EXT_11 |
| 118 | #define MIN_CHARSET_PRIVATE_DIMENSION2 LEADING_CODE_EXT_21 |
| 119 | |
| 120 | /* Maximum value of overall charset identification number. */ |
| 121 | #define MAX_CHARSET 0xFE |
| 122 | |
| 123 | /* Definition of special charsets. */ |
| 124 | #define CHARSET_ASCII 0 |
| 125 | #define CHARSET_COMPOSITION 0x80 |
| 126 | |
| 127 | extern int charset_ascii; /* ASCII */ |
| 128 | extern int charset_composition; /* for a composite character */ |
| 129 | extern int charset_latin_iso8859_1; /* ISO8859-1 (Latin-1) */ |
| 130 | extern int charset_jisx0208_1978; /* JISX0208.1978 (Japanese Kanji old set) */ |
| 131 | extern int charset_jisx0208; /* JISX0208.1983 (Japanese Kanji) */ |
| 132 | extern int charset_katakana_jisx0201; /* JISX0201.Kana (Japanese Katakana) */ |
| 133 | extern int charset_latin_jisx0201; /* JISX0201.Roman (Japanese Roman) */ |
| 134 | extern int charset_big5_1; /* Big5 Level 1 (Chinese Traditional) */ |
| 135 | extern int charset_big5_2; /* Big5 Level 2 (Chinese Traditional) */ |
| 136 | |
| 137 | /* Check if CH is the head of multi-byte form, i.e., |
| 138 | an ASCII character or a base leading-code. */ |
| 139 | #define CHAR_HEAD_P(ch) ((unsigned char) (ch) < 0xA0) |
| 140 | |
| 141 | /*** GENERAL NOTE on CHARACTER REPRESENTATION *** |
| 142 | |
| 143 | At first, the term "character" or "char" is used for a multilingual |
| 144 | character (of course, including ASCII character), not for a byte in |
| 145 | computer memory. We use the term "code" or "byte" for the latter |
| 146 | case. |
| 147 | |
| 148 | A character is identified by charset and one or two POSITION-CODEs. |
| 149 | POSITION-CODE is the position of the character in the charset. A |
| 150 | character of DIMENSION1 charset has one POSITION-CODE: POSITION-CODE-1. |
| 151 | A character of DIMENSION2 charset has two POSITION-CODE: |
| 152 | POSITION-CODE-1 and POSITION-CODE-2. The code range of |
| 153 | POSITION-CODE is 0x20..0x7F. |
| 154 | |
| 155 | Emacs has two kinds of representation of a character: multi-byte |
| 156 | form (for buffer and string) and single-word form (for character |
| 157 | object in Emacs Lisp). The latter is called "character code" here |
| 158 | after. Both representation encode the information of charset and |
| 159 | POSITION-CODE but in a different way (for instance, MSB of |
| 160 | POSITION-CODE is set in multi-byte form). |
| 161 | |
| 162 | For details of multi-byte form, see the section "2. Emacs internal |
| 163 | format handlers" of `coding.c'. |
| 164 | |
| 165 | Emacs uses 19 bits for a character code. The bits are divided into |
| 166 | 3 fields: FIELD1(5bits):FIELD2(7bits):FIELD3(7bits). |
| 167 | |
| 168 | A character code of DIMENSION1 character uses FIELD2 to hold charset |
| 169 | and FIELD3 to hold POSITION-CODE-1. A character code of DIMENSION2 |
| 170 | character uses FIELD1 to hold charset, FIELD2 and FIELD3 to hold |
| 171 | POSITION-CODE-1 and POSITION-CODE-2 respectively. |
| 172 | |
| 173 | More precisely... |
| 174 | |
| 175 | FIELD2 of DIMENSION1 character (except for ASCII) is "charset - 0x70". |
| 176 | This is to make all character codes except for ASCII greater than |
| 177 | 256 (ASCII's FIELD2 is 0). So, the range of FIELD2 of DIMENSION1 |
| 178 | character is 0 or 0x11..0x7F. |
| 179 | |
| 180 | FIELD1 of DIMENSION2 character is "charset - 0x8F" for official |
| 181 | charset and "charset - 0xE0" for private charset. So, the range of |
| 182 | FIELD1 of DIMENSION2 character is 0x01..0x1E. |
| 183 | |
| 184 | ----------------------------------------------------------------------- |
| 185 | charset FIELD1 (5-bit) FIELD2 (7-bit) FIELD3 (7-bit) |
| 186 | ----------------------------------------------------------------------- |
| 187 | ASCII 0 0 POSITION-CODE-1 |
| 188 | DIMENSION1 0 charset - 0x70 POSITION-CODE-1 |
| 189 | DIMENSION2(o) charset - 0x8F POSITION-CODE-1 POSITION-CODE-2 |
| 190 | DIMENSION2(p) charset - 0xE0 POSITION-CODE-1 POSITION-CODE-2 |
| 191 | ----------------------------------------------------------------------- |
| 192 | "(o)": official, "(p)": private |
| 193 | ----------------------------------------------------------------------- |
| 194 | |
| 195 | */ |
| 196 | |
| 197 | /*** GENERAL NOTE on COMPOSITE CHARACTER *** |
| 198 | |
| 199 | A composite character is a character composed from several (up to |
| 200 | 16) non-composite characters (components). Although each components |
| 201 | can belong to any charset, a composite character itself belongs to |
| 202 | the charset `charset-composition' and is assigned a special |
| 203 | leading-code `LEADING_CODE_COMPOSITION' for multi-byte form. See |
| 204 | the document "2. Emacs internal format handlers" in `coding.c' for |
| 205 | more detail about multi-byte form. |
| 206 | |
| 207 | A character code of composite character has special format. In the |
| 208 | above document, FIELD1 of a composite character is 0x1F. Each |
| 209 | composite character is assigned a sequential number CMPCHAR-ID. |
| 210 | FIELD2 and FIELD3 are combined to make 14bits field for holding |
| 211 | CMPCHAR-ID, which means that Emacs can handle at most 2^14 (= 16384) |
| 212 | composite characters at once. |
| 213 | |
| 214 | ----------------------------------------------------------------------- |
| 215 | charset FIELD1 (5-bit) FIELD2&3 (14-bit) |
| 216 | ----------------------------------------------------------------------- |
| 217 | CHARSET-COMPOSITION 0x1F CMPCHAR-ID |
| 218 | ----------------------------------------------------------------------- |
| 219 | |
| 220 | Emacs assigns CMPCHAR-ID to a composite character only when it |
| 221 | requires the character code of the composite character (e.g. while |
| 222 | displaying the composite character). |
| 223 | |
| 224 | */ |
| 225 | |
| 226 | /* Masks of each field of character code. */ |
| 227 | #define CHAR_FIELD1_MASK (0x1F << 14) |
| 228 | #define CHAR_FIELD2_MASK (0x7F << 7) |
| 229 | #define CHAR_FIELD3_MASK 0x7F |
| 230 | |
| 231 | /* Macros to access each field of character C. */ |
| 232 | #define CHAR_FIELD1(c) (((c) & CHAR_FIELD1_MASK) >> 14) |
| 233 | #define CHAR_FIELD2(c) (((c) & CHAR_FIELD2_MASK) >> 7) |
| 234 | #define CHAR_FIELD3(c) ((c) & CHAR_FIELD3_MASK) |
| 235 | |
| 236 | /* Minimum character code of character of each DIMENSION. */ |
| 237 | #define MIN_CHAR_OFFICIAL_DIMENSION1 \ |
| 238 | ((MIN_CHARSET_OFFICIAL_DIMENSION1 - 0x70) << 7) |
| 239 | #define MIN_CHAR_PRIVATE_DIMENSION1 \ |
| 240 | ((MIN_CHARSET_PRIVATE_DIMENSION1 - 0x70) << 7) |
| 241 | #define MIN_CHAR_OFFICIAL_DIMENSION2 \ |
| 242 | ((MIN_CHARSET_OFFICIAL_DIMENSION2 - 0x8F) << 14) |
| 243 | #define MIN_CHAR_PRIVATE_DIMENSION2 \ |
| 244 | ((MIN_CHARSET_PRIVATE_DIMENSION2 - 0xE0) << 14) |
| 245 | #define MIN_CHAR_COMPOSITION \ |
| 246 | (0x1F << 14) |
| 247 | #define MAX_CHAR_COMPOSITION GLYPH_MASK_CHAR |
| 248 | |
| 249 | /* 1 if C is an ASCII character, else 0. */ |
| 250 | #define SINGLE_BYTE_CHAR_P(c) ((c) < 0x100) |
| 251 | /* 1 if C is an composite character, else 0. */ |
| 252 | #define COMPOSITE_CHAR_P(c) ((c) >= MIN_CHAR_COMPOSITION) |
| 253 | |
| 254 | /* 1 if BYTE is a character in itself, in multibyte mode. */ |
| 255 | #define ASCII_BYTE_P(byte) ((byte) < 0x80) |
| 256 | |
| 257 | /* A char-table containing information of each character set. |
| 258 | |
| 259 | Unlike ordinary char-tables, this doesn't contain any nested table. |
| 260 | Only the top level elements are used. Each element is a vector of |
| 261 | the following information: |
| 262 | CHARSET-ID, BYTES, DIMENSION, CHARS, WIDTH, DIRECTION, |
| 263 | LEADING-CODE-BASE, LEADING-CODE-EXT, |
| 264 | ISO-FINAL-CHAR, ISO-GRAPHIC-PLANE, |
| 265 | REVERSE-CHARSET, SHORT-NAME, LONG-NAME, DESCRIPTION, |
| 266 | PLIST. |
| 267 | |
| 268 | CHARSET-ID (integer) is the identification number of the charset. |
| 269 | |
| 270 | BYTE (integer) is the length of multi-byte form of a character in |
| 271 | the charset: one of 1, 2, 3, and 4. |
| 272 | |
| 273 | DIMENSION (integer) is the number of bytes to represent a character: 1 or 2. |
| 274 | |
| 275 | CHARS (integer) is the number of characters in a dimension: 94 or 96. |
| 276 | |
| 277 | WIDTH (integer) is the number of columns a character in the charset |
| 278 | occupies on the screen: one of 0, 1, and 2. |
| 279 | |
| 280 | DIRECTION (integer) is the rendering direction of characters in the |
| 281 | charset when rendering. If 0, render from right to left, else |
| 282 | render from left to right. |
| 283 | |
| 284 | LEADING-CODE-BASE (integer) is the base leading-code for the |
| 285 | charset. |
| 286 | |
| 287 | LEADING-CODE-EXT (integer) is the extended leading-code for the |
| 288 | charset. All charsets of less than 0xA0 has the value 0. |
| 289 | |
| 290 | ISO-FINAL-CHAR (character) is the final character of the |
| 291 | corresponding ISO 2022 charset. |
| 292 | |
| 293 | ISO-GRAPHIC-PLANE (integer) is the graphic plane to be invoked |
| 294 | while encoding to variants of ISO 2022 coding system, one of the |
| 295 | following: 0/graphic-plane-left(GL), 1/graphic-plane-right(GR). |
| 296 | |
| 297 | REVERSE-CHARSET (integer) is the charset which differs only in |
| 298 | LEFT-TO-RIGHT value from the charset. If there's no such a |
| 299 | charset, the value is -1. |
| 300 | |
| 301 | SHORT-NAME (string) is the short name to refer to the charset. |
| 302 | |
| 303 | LONG-NAME (string) is the long name to refer to the charset. |
| 304 | |
| 305 | DESCRIPTION (string) is the description string of the charset. |
| 306 | |
| 307 | PLIST (property list) may contain any type of information a user |
| 308 | want to put and get by functions `put-charset-property' and |
| 309 | `get-charset-property' respectively. */ |
| 310 | extern Lisp_Object Vcharset_table; |
| 311 | |
| 312 | /* Macros to access various information of CHARSET in Vcharset_table. |
| 313 | We provide these macros for efficiency. No range check of CHARSET. */ |
| 314 | |
| 315 | /* Return entry of CHARSET (lisp integer) in Vcharset_table. */ |
| 316 | #define CHARSET_TABLE_ENTRY(charset) \ |
| 317 | XCHAR_TABLE (Vcharset_table)->contents[((charset) == CHARSET_ASCII \ |
| 318 | ? 0 : (charset) + 128)] |
| 319 | |
| 320 | /* Return information INFO-IDX of CHARSET. */ |
| 321 | #define CHARSET_TABLE_INFO(charset, info_idx) \ |
| 322 | XVECTOR (CHARSET_TABLE_ENTRY (charset))->contents[info_idx] |
| 323 | |
| 324 | #define CHARSET_ID_IDX (0) |
| 325 | #define CHARSET_BYTES_IDX (1) |
| 326 | #define CHARSET_DIMENSION_IDX (2) |
| 327 | #define CHARSET_CHARS_IDX (3) |
| 328 | #define CHARSET_WIDTH_IDX (4) |
| 329 | #define CHARSET_DIRECTION_IDX (5) |
| 330 | #define CHARSET_LEADING_CODE_BASE_IDX (6) |
| 331 | #define CHARSET_LEADING_CODE_EXT_IDX (7) |
| 332 | #define CHARSET_ISO_FINAL_CHAR_IDX (8) |
| 333 | #define CHARSET_ISO_GRAPHIC_PLANE_IDX (9) |
| 334 | #define CHARSET_REVERSE_CHARSET_IDX (10) |
| 335 | #define CHARSET_SHORT_NAME_IDX (11) |
| 336 | #define CHARSET_LONG_NAME_IDX (12) |
| 337 | #define CHARSET_DESCRIPTION_IDX (13) |
| 338 | #define CHARSET_PLIST_IDX (14) |
| 339 | /* Size of a vector of each entry of Vcharset_table. */ |
| 340 | #define CHARSET_MAX_IDX (15) |
| 341 | |
| 342 | /* And several more macros to be used frequently. */ |
| 343 | #define CHARSET_BYTES(charset) \ |
| 344 | XFASTINT (CHARSET_TABLE_INFO (charset, CHARSET_BYTES_IDX)) |
| 345 | #define CHARSET_DIMENSION(charset) \ |
| 346 | XFASTINT (CHARSET_TABLE_INFO (charset, CHARSET_DIMENSION_IDX)) |
| 347 | #define CHARSET_CHARS(charset) \ |
| 348 | XFASTINT (CHARSET_TABLE_INFO (charset, CHARSET_CHARS_IDX)) |
| 349 | #define CHARSET_WIDTH(charset) \ |
| 350 | XFASTINT (CHARSET_TABLE_INFO (charset, CHARSET_WIDTH_IDX)) |
| 351 | #define CHARSET_DIRECTION(charset) \ |
| 352 | XFASTINT (CHARSET_TABLE_INFO (charset, CHARSET_DIRECTION_IDX)) |
| 353 | #define CHARSET_LEADING_CODE_BASE(charset) \ |
| 354 | XFASTINT (CHARSET_TABLE_INFO (charset, CHARSET_LEADING_CODE_BASE_IDX)) |
| 355 | #define CHARSET_LEADING_CODE_EXT(charset) \ |
| 356 | XFASTINT (CHARSET_TABLE_INFO (charset, CHARSET_LEADING_CODE_EXT_IDX)) |
| 357 | #define CHARSET_ISO_FINAL_CHAR(charset) \ |
| 358 | XFASTINT (CHARSET_TABLE_INFO (charset, CHARSET_ISO_FINAL_CHAR_IDX)) |
| 359 | #define CHARSET_ISO_GRAPHIC_PLANE(charset) \ |
| 360 | XFASTINT (CHARSET_TABLE_INFO (charset, CHARSET_ISO_GRAPHIC_PLANE_IDX)) |
| 361 | #define CHARSET_REVERSE_CHARSET(charset) \ |
| 362 | XINT (CHARSET_TABLE_INFO (charset, CHARSET_REVERSE_CHARSET_IDX)) |
| 363 | |
| 364 | /* Macros to specify direction of a charset. */ |
| 365 | #define CHARSET_DIRECTION_LEFT_TO_RIGHT 0 |
| 366 | #define CHARSET_DIRECTION_RIGHT_TO_LEFT 1 |
| 367 | |
| 368 | /* A vector of charset symbol indexed by charset-id. This is used |
| 369 | only for returning charset symbol from C functions. */ |
| 370 | extern Lisp_Object Vcharset_symbol_table; |
| 371 | |
| 372 | /* Return symbol of CHARSET. */ |
| 373 | #define CHARSET_SYMBOL(charset) \ |
| 374 | XVECTOR (Vcharset_symbol_table)->contents[charset] |
| 375 | |
| 376 | /* 1 if CHARSET is valid, else 0. */ |
| 377 | #define CHARSET_VALID_P(charset) \ |
| 378 | ((charset) == 0 \ |
| 379 | || ((charset) >= 0x80 && (charset) <= MAX_CHARSET_OFFICIAL_DIMENSION2) \ |
| 380 | || ((charset) >= MIN_CHARSET_PRIVATE_DIMENSION1 && (charset) <= MAX_CHARSET)) |
| 381 | |
| 382 | /* 1 if CHARSET is already defined, else 0. */ |
| 383 | #define CHARSET_DEFINED_P(charset) \ |
| 384 | (((charset) >= 0) && ((charset) <= MAX_CHARSET) \ |
| 385 | && !NILP (CHARSET_TABLE_ENTRY (charset))) |
| 386 | |
| 387 | /* Since the information CHARSET-BYTES and CHARSET-WIDTH of |
| 388 | Vcharset_table can be retrieved only from the first byte of |
| 389 | multi-byte form (an ASCII code or a base leading-code), we provide |
| 390 | here tables to be used by macros BYTES_BY_CHAR_HEAD and |
| 391 | WIDTH_BY_CHAR_HEAD for faster information retrieval. */ |
| 392 | extern int bytes_by_char_head[256]; |
| 393 | extern int width_by_char_head[256]; |
| 394 | |
| 395 | #define BYTES_BY_CHAR_HEAD(char_head) bytes_by_char_head[char_head] |
| 396 | #define WIDTH_BY_CHAR_HEAD(char_head) width_by_char_head[char_head] |
| 397 | |
| 398 | /* Charset of the character C. */ |
| 399 | #define CHAR_CHARSET(c) \ |
| 400 | (SINGLE_BYTE_CHAR_P (c) \ |
| 401 | ? CHARSET_ASCII \ |
| 402 | : ((c) < MIN_CHAR_OFFICIAL_DIMENSION2 \ |
| 403 | ? CHAR_FIELD2 (c) + 0x70 \ |
| 404 | : ((c) < MIN_CHAR_PRIVATE_DIMENSION2 \ |
| 405 | ? CHAR_FIELD1 (c) + 0x8F \ |
| 406 | : ((c) < MIN_CHAR_COMPOSITION \ |
| 407 | ? CHAR_FIELD1 (c) + 0xE0 \ |
| 408 | : ((c) <= MAX_CHAR_COMPOSITION \ |
| 409 | ? CHARSET_COMPOSITION \ |
| 410 | : CHARSET_ASCII))))) |
| 411 | |
| 412 | /* Return charset at the place pointed by P. */ |
| 413 | #define CHARSET_AT(p) \ |
| 414 | (*(p) < 0x80 \ |
| 415 | ? CHARSET_ASCII \ |
| 416 | : (*(p) == LEADING_CODE_COMPOSITION \ |
| 417 | ? CHARSET_COMPOSITION \ |
| 418 | : (*(p) < LEADING_CODE_PRIVATE_11 \ |
| 419 | ? (int)*(p) \ |
| 420 | : (*(p) <= LEADING_CODE_PRIVATE_22 \ |
| 421 | ? (int)*((p) + 1) \ |
| 422 | : -1)))) |
| 423 | |
| 424 | /* Same as `CHARSET_AT ()' but perhaps runs faster because of an |
| 425 | additional argument C which is the code (byte) at P. */ |
| 426 | #define FIRST_CHARSET_AT(p, c) \ |
| 427 | ((c) < 0x80 \ |
| 428 | ? CHARSET_ASCII \ |
| 429 | : ((c) == LEADING_CODE_COMPOSITION \ |
| 430 | ? CHARSET_COMPOSITION \ |
| 431 | : ((c) < LEADING_CODE_PRIVATE_11 \ |
| 432 | ? (int)(c) \ |
| 433 | : ((c) <= LEADING_CODE_PRIVATE_22 \ |
| 434 | ? (int)*((p) + 1) \ |
| 435 | : -1)))) |
| 436 | |
| 437 | /* Check if two characters C1 and C2 belong to the same charset. |
| 438 | Always return 0 for composite characters. */ |
| 439 | #define SAME_CHARSET_P(c1, c2) \ |
| 440 | (c1 < MIN_CHAR_COMPOSITION \ |
| 441 | && (SINGLE_BYTE_CHAR_P (c1) \ |
| 442 | ? SINGLE_BYTE_CHAR_P (c2) \ |
| 443 | : (c1 < MIN_CHAR_OFFICIAL_DIMENSION2 \ |
| 444 | ? (c1 & CHAR_FIELD2_MASK) == (c2 & CHAR_FIELD2_MASK) \ |
| 445 | : (c1 & CHAR_FIELD1_MASK) == (c2 & CHAR_FIELD1_MASK)))) |
| 446 | |
| 447 | /* Return a non-ASCII character of which charset is CHARSET and |
| 448 | position-codes are C1 and C2. DIMENSION1 character ignores C2. */ |
| 449 | #define MAKE_NON_ASCII_CHAR(charset, c1, c2) \ |
| 450 | ((charset) == CHARSET_COMPOSITION \ |
| 451 | ? MAKE_COMPOSITE_CHAR (((c1) << 7) + (c2)) \ |
| 452 | : (CHARSET_DIMENSION (charset) == 1 \ |
| 453 | ? (((charset) - 0x70) << 7) | (c1) \ |
| 454 | : ((charset) < MIN_CHARSET_PRIVATE_DIMENSION2 \ |
| 455 | ? (((charset) - 0x8F) << 14) | ((c1) << 7) | (c2) \ |
| 456 | : (((charset) - 0xE0) << 14) | ((c1) << 7) | (c2)))) |
| 457 | |
| 458 | /* Return a composite character of which CMPCHAR-ID is ID. */ |
| 459 | #define MAKE_COMPOSITE_CHAR(id) (MIN_CHAR_COMPOSITION + (id)) |
| 460 | |
| 461 | /* Return CMPCHAR-ID of a composite character C. */ |
| 462 | #define COMPOSITE_CHAR_ID(c) ((c) - MIN_CHAR_COMPOSITION) |
| 463 | |
| 464 | /* Return a character of which charset is CHARSET and position-codes |
| 465 | are C1 and C2. DIMENSION1 character ignores C2. */ |
| 466 | #define MAKE_CHAR(charset, c1, c2) \ |
| 467 | ((charset) == CHARSET_ASCII \ |
| 468 | ? (c1) \ |
| 469 | : MAKE_NON_ASCII_CHAR ((charset), (c1) & 0x7F, (c2) & 0x7F)) |
| 470 | |
| 471 | /* If GENERICP is nonzero, return nonzero iff C is a valid normal or |
| 472 | generic character. If GENERICP is zero, return nonzero iff C is a |
| 473 | valid normal character. */ |
| 474 | #define CHAR_VALID_P(c, genericp) \ |
| 475 | ((c) >= 0 \ |
| 476 | && (SINGLE_BYTE_CHAR_P (c) || char_valid_p (c, genericp))) |
| 477 | |
| 478 | /* This default value is used when nonascii-translate-table or |
| 479 | nonascii-insert-offset fail to convert unibyte character to a valid |
| 480 | multibyte character. This makes a Latin-1 character. */ |
| 481 | |
| 482 | #define DEFAULT_NONASCII_INSERT_OFFSET 0x800 |
| 483 | |
| 484 | /* Check if the character C is valid as a multibyte character. */ |
| 485 | |
| 486 | #define VALID_MULTIBYTE_CHAR_P(c) \ |
| 487 | ((c) < MIN_CHAR_OFFICIAL_DIMENSION2 \ |
| 488 | ? (!NILP (XCHAR_TABLE (Vcharset_table)->contents[CHAR_FIELD2 (c) \ |
| 489 | + 0xF0]) \ |
| 490 | && CHAR_FIELD3 (c) >= 32) \ |
| 491 | : ((c) < MIN_CHAR_PRIVATE_DIMENSION2 \ |
| 492 | ? (!NILP (XCHAR_TABLE (Vcharset_table)->contents[CHAR_FIELD1 (c) \ |
| 493 | + 0x10F]) \ |
| 494 | && CHAR_FIELD2 (c) >= 32 && CHAR_FIELD3 (c) >= 32) \ |
| 495 | : ((c) < MIN_CHAR_COMPOSITION \ |
| 496 | ? (!NILP (XCHAR_TABLE (Vcharset_table)->contents[CHAR_FIELD1 (c) \ |
| 497 | + 0x160]) \ |
| 498 | && CHAR_FIELD2 (c) >= 32 && CHAR_FIELD3 (c) >= 32) \ |
| 499 | : (c) < MIN_CHAR_COMPOSITION + n_cmpchars))) |
| 500 | |
| 501 | /* The charset of non-ASCII character C is stored in CHARSET, and the |
| 502 | position-codes of C are stored in C1 and C2. |
| 503 | We store -1 in C2 if the character is just 2 bytes. |
| 504 | |
| 505 | Do not use this macro for an ASCII character. */ |
| 506 | |
| 507 | #define SPLIT_NON_ASCII_CHAR(c, charset, c1, c2) \ |
| 508 | ((c) < MIN_CHAR_OFFICIAL_DIMENSION2 \ |
| 509 | ? (charset = CHAR_FIELD2 (c) + 0x70, \ |
| 510 | c1 = CHAR_FIELD3 (c), \ |
| 511 | c2 = -1) \ |
| 512 | : (charset = ((c) < MIN_CHAR_COMPOSITION \ |
| 513 | ? (CHAR_FIELD1 (c) \ |
| 514 | + ((c) < MIN_CHAR_PRIVATE_DIMENSION2 ? 0x8F : 0xE0)) \ |
| 515 | : CHARSET_COMPOSITION), \ |
| 516 | c1 = CHAR_FIELD2 (c), \ |
| 517 | c2 = CHAR_FIELD3 (c))) |
| 518 | |
| 519 | /* The charset of character C is stored in CHARSET, and the |
| 520 | position-codes of C are stored in C1 and C2. |
| 521 | We store -1 in C2 if the character is just 2 bytes. */ |
| 522 | |
| 523 | #define SPLIT_CHAR(c, charset, c1, c2) \ |
| 524 | (SINGLE_BYTE_CHAR_P (c) \ |
| 525 | ? charset = CHARSET_ASCII, c1 = (c), c2 = -1 \ |
| 526 | : SPLIT_NON_ASCII_CHAR (c, charset, c1, c2)) |
| 527 | |
| 528 | /* The charset of the character at STR is stored in CHARSET, and the |
| 529 | position-codes are stored in C1 and C2. |
| 530 | We store -1 in C2 if the character is just 2 bytes. |
| 531 | |
| 532 | If the character is a composite character, the upper 7-bit and |
| 533 | lower 7-bit of CMPCHAR-ID are set in C1 and C2 respectively. No |
| 534 | range checking. */ |
| 535 | |
| 536 | #define SPLIT_STRING(str, len, charset, c1, c2) \ |
| 537 | ((BYTES_BY_CHAR_HEAD ((unsigned char) *(str)) < 2 \ |
| 538 | || BYTES_BY_CHAR_HEAD ((unsigned char) *(str)) > len \ |
| 539 | || split_non_ascii_string (str, len, &charset, &c1, &c2) < 0) \ |
| 540 | ? c1 = *(str), charset = CHARSET_ASCII \ |
| 541 | : charset) |
| 542 | |
| 543 | /* Mapping table from ISO2022's charset (specified by DIMENSION, |
| 544 | CHARS, and FINAL_CHAR) to Emacs' charset. Should be accessed by |
| 545 | macro ISO_CHARSET_TABLE (DIMENSION, CHARS, FINAL_CHAR). */ |
| 546 | extern int iso_charset_table[2][2][128]; |
| 547 | |
| 548 | #define ISO_CHARSET_TABLE(dimension, chars, final_char) \ |
| 549 | iso_charset_table[XINT (dimension) - 1][XINT (chars) > 94][XINT (final_char)] |
| 550 | |
| 551 | #define BASE_LEADING_CODE_P(c) (BYTES_BY_CHAR_HEAD ((unsigned char) (c)) > 1) |
| 552 | |
| 553 | /* The following two macros CHAR_STRING and STRING_CHAR are the main |
| 554 | entry points to convert between Emacs two types of character |
| 555 | representations: multi-byte form and single-word form (character |
| 556 | code). */ |
| 557 | |
| 558 | /* Set STR a pointer to the multi-byte form of the character C. If C |
| 559 | is not a composite character, the multi-byte form is set in WORKBUF |
| 560 | and STR points WORKBUF. The caller should allocate at least 4-byte |
| 561 | area at WORKBUF in advance. Returns the length of the multi-byte |
| 562 | form. If C is an invalid character code, signal an error. */ |
| 563 | |
| 564 | #define CHAR_STRING(c, workbuf, str) \ |
| 565 | (SINGLE_BYTE_CHAR_P (c) \ |
| 566 | ? *(str = workbuf) = (unsigned char)(c), 1 \ |
| 567 | : non_ascii_char_to_string (c, workbuf, (unsigned char **)&str)) |
| 568 | |
| 569 | /* Return a character code of the character of which multi-byte form |
| 570 | is at STR and the length is LEN. If STR doesn't contain valid |
| 571 | multi-byte form, only the first byte in STR is returned. */ |
| 572 | |
| 573 | #define STRING_CHAR(str, len) \ |
| 574 | ((BYTES_BY_CHAR_HEAD ((unsigned char) *(str)) == 1 \ |
| 575 | || BYTES_BY_CHAR_HEAD ((unsigned char) *(str)) > (len)) \ |
| 576 | ? (unsigned char) *(str) \ |
| 577 | : string_to_non_ascii_char (str, len, 0)) |
| 578 | |
| 579 | /* This is like STRING_CHAR but the third arg ACTUAL_LEN is set to |
| 580 | the length of the multi-byte form. Just to know the length, use |
| 581 | MULTIBYTE_FORM_LENGTH. */ |
| 582 | |
| 583 | #define STRING_CHAR_AND_LENGTH(str, len, actual_len) \ |
| 584 | ((BYTES_BY_CHAR_HEAD ((unsigned char) *(str)) == 1 \ |
| 585 | || BYTES_BY_CHAR_HEAD ((unsigned char) *(str)) > (len)) \ |
| 586 | ? (actual_len = 1), (unsigned char) *(str) \ |
| 587 | : string_to_non_ascii_char (str, len, &actual_len)) |
| 588 | |
| 589 | /* Fetch the "next" multibyte character from Lisp string STRING |
| 590 | at byte position BYTEIDX, character position CHARIDX. |
| 591 | Store it into OUTPUT. |
| 592 | |
| 593 | All the args must be side-effect-free. |
| 594 | BYTEIDX and CHARIDX must be lvalues; |
| 595 | we increment them past the character fetched. */ |
| 596 | |
| 597 | #define FETCH_STRING_CHAR_ADVANCE(OUTPUT, STRING, CHARIDX, BYTEIDX) \ |
| 598 | if (1) \ |
| 599 | { \ |
| 600 | unsigned char *fetch_string_char_ptr = &XSTRING (STRING)->data[BYTEIDX]; \ |
| 601 | int fetch_string_char_space_left = XSTRING (STRING)->size_byte - BYTEIDX; \ |
| 602 | int actual_len; \ |
| 603 | \ |
| 604 | OUTPUT \ |
| 605 | = STRING_CHAR_AND_LENGTH (fetch_string_char_ptr, \ |
| 606 | fetch_string_char_space_left, actual_len); \ |
| 607 | \ |
| 608 | BYTEIDX += actual_len; \ |
| 609 | CHARIDX++; \ |
| 610 | } \ |
| 611 | else |
| 612 | |
| 613 | /* Return the length of the multi-byte form at string STR of length LEN. */ |
| 614 | |
| 615 | #define MULTIBYTE_FORM_LENGTH(str, len) \ |
| 616 | (BYTES_BY_CHAR_HEAD (*(unsigned char *)(str)) == 1 \ |
| 617 | ? 1 \ |
| 618 | : multibyte_form_length (str, len)) |
| 619 | |
| 620 | /* Set C a (possibly multibyte) character at P. P points into a |
| 621 | string which is the virtual concatenation of STR1 (which ends at |
| 622 | END1) or STR2 (which ends at END2). */ |
| 623 | |
| 624 | #define GET_CHAR_AFTER_2(c, p, str1, end1, str2, end2) \ |
| 625 | do { \ |
| 626 | const char *dtemp = (p) == (end1) ? (str2) : (p); \ |
| 627 | const char *dlimit = ((p) >= (str1) && (p) < (end1)) ? (end1) : (end2); \ |
| 628 | c = STRING_CHAR (dtemp, dlimit - dtemp); \ |
| 629 | } while (0) |
| 630 | |
| 631 | /* Set C a (possibly multibyte) character before P. P points into a |
| 632 | string which is the virtual concatenation of STR1 (which ends at |
| 633 | END1) or STR2 (which ends at END2). */ |
| 634 | |
| 635 | #define GET_CHAR_BEFORE_2(c, p, str1, end1, str2, end2) \ |
| 636 | do { \ |
| 637 | const char *dtemp = (p); \ |
| 638 | const char *dlimit = ((p) > (str2) && (p) <= (end2)) ? (str2) : (str1); \ |
| 639 | while (dtemp-- > dlimit && (unsigned char) *dtemp >= 0xA0); \ |
| 640 | c = STRING_CHAR (dtemp, p - dtemp); \ |
| 641 | } while (0) |
| 642 | |
| 643 | #ifdef emacs |
| 644 | |
| 645 | /* Increase the buffer point POS of the current buffer to the next |
| 646 | character boundary. This macro relies on the fact that *GPT_ADDR |
| 647 | and *Z_ADDR are always accessible and the values are '\0'. No |
| 648 | range checking of POS. */ |
| 649 | #define INC_POS(pos) \ |
| 650 | do { \ |
| 651 | unsigned char *p = BYTE_POS_ADDR (pos); \ |
| 652 | pos++; \ |
| 653 | if (BASE_LEADING_CODE_P (*p++)) \ |
| 654 | while (!CHAR_HEAD_P (*p)) p++, pos++; \ |
| 655 | } while (0) |
| 656 | |
| 657 | /* Decrease the buffer point POS of the current buffer to the previous |
| 658 | character boundary. No range checking of POS. */ |
| 659 | #define DEC_POS(pos) \ |
| 660 | do { \ |
| 661 | unsigned char *p, *p_min; \ |
| 662 | \ |
| 663 | pos--; \ |
| 664 | if (pos < GPT_BYTE) \ |
| 665 | p = BEG_ADDR + pos - 1, p_min = BEG_ADDR; \ |
| 666 | else \ |
| 667 | p = BEG_ADDR + GAP_SIZE + pos - 1, p_min = GAP_END_ADDR; \ |
| 668 | if (p > p_min && !CHAR_HEAD_P (*p)) \ |
| 669 | { \ |
| 670 | int pos_saved = pos--; \ |
| 671 | p--; \ |
| 672 | while (p > p_min && !CHAR_HEAD_P (*p)) p--, pos--; \ |
| 673 | if (!BASE_LEADING_CODE_P (*p)) pos = pos_saved; \ |
| 674 | } \ |
| 675 | } while (0) |
| 676 | |
| 677 | /* Increment both CHARPOS and BYTEPOS, each in the appropriate way. */ |
| 678 | |
| 679 | #define INC_BOTH(charpos, bytepos) \ |
| 680 | do \ |
| 681 | { \ |
| 682 | (charpos)++; \ |
| 683 | if (NILP (current_buffer->enable_multibyte_characters)) \ |
| 684 | (bytepos)++; \ |
| 685 | else \ |
| 686 | INC_POS ((bytepos)); \ |
| 687 | } \ |
| 688 | while (0) |
| 689 | |
| 690 | /* Decrement both CHARPOS and BYTEPOS, each in the appropriate way. */ |
| 691 | |
| 692 | #define DEC_BOTH(charpos, bytepos) \ |
| 693 | do \ |
| 694 | { \ |
| 695 | (charpos)--; \ |
| 696 | if (NILP (current_buffer->enable_multibyte_characters)) \ |
| 697 | (bytepos)--; \ |
| 698 | else \ |
| 699 | DEC_POS ((bytepos)); \ |
| 700 | } \ |
| 701 | while (0) |
| 702 | |
| 703 | /* Increase the buffer point POS of the current buffer to the next |
| 704 | character boundary. This macro relies on the fact that *GPT_ADDR |
| 705 | and *Z_ADDR are always accessible and the values are '\0'. No |
| 706 | range checking of POS. */ |
| 707 | #define BUF_INC_POS(buf, pos) \ |
| 708 | do { \ |
| 709 | unsigned char *p = BUF_BYTE_ADDRESS (buf, pos); \ |
| 710 | pos++; \ |
| 711 | if (BASE_LEADING_CODE_P (*p++)) \ |
| 712 | while (!CHAR_HEAD_P (*p)) p++, pos++; \ |
| 713 | } while (0) |
| 714 | |
| 715 | /* Decrease the buffer point POS of the current buffer to the previous |
| 716 | character boundary. No range checking of POS. */ |
| 717 | #define BUF_DEC_POS(buf, pos) \ |
| 718 | do { \ |
| 719 | unsigned char *p, *p_min; \ |
| 720 | int pos_saved = --pos; \ |
| 721 | if (pos < BUF_GPT_BYTE (buf)) \ |
| 722 | { \ |
| 723 | p = BUF_BEG_ADDR (buf) + pos - 1; \ |
| 724 | p_min = BUF_BEG_ADDR (buf); \ |
| 725 | } \ |
| 726 | else \ |
| 727 | { \ |
| 728 | p = BUF_BEG_ADDR (buf) + BUF_GAP_SIZE (buf) + pos - 1; \ |
| 729 | p_min = BUF_GAP_END_ADDR (buf); \ |
| 730 | } \ |
| 731 | if (p > p_min && !CHAR_HEAD_P (*p)) \ |
| 732 | { \ |
| 733 | int pos_saved = pos--; \ |
| 734 | p--; \ |
| 735 | while (p > p_min && !CHAR_HEAD_P (*p)) p--, pos--; \ |
| 736 | if (!BASE_LEADING_CODE_P (*p)) pos = pos_saved; \ |
| 737 | } \ |
| 738 | } while (0) |
| 739 | |
| 740 | #endif /* emacs */ |
| 741 | |
| 742 | /* Maximum counts of components in one composite character. */ |
| 743 | #define MAX_COMPONENT_COUNT 16 |
| 744 | |
| 745 | /* Structure to hold information of a composite character. */ |
| 746 | struct cmpchar_info { |
| 747 | /* Byte length of the composite character. */ |
| 748 | int len; |
| 749 | |
| 750 | /* Multi-byte form of the composite character. */ |
| 751 | unsigned char *data; |
| 752 | |
| 753 | /* Length of glyph codes. */ |
| 754 | int glyph_len; |
| 755 | |
| 756 | /* Width of the overall glyph of the composite character. */ |
| 757 | int width; |
| 758 | |
| 759 | /* Pointer to an array of glyph codes of the composite character. |
| 760 | This actually contains only character code, no face. */ |
| 761 | GLYPH *glyph; |
| 762 | |
| 763 | /* Pointer to an array of composition rules. The value has the form: |
| 764 | (0xA0 + ((GLOBAL-REF-POINT << 2) | NEW-REF-POINT)) |
| 765 | where each XXX-REF-POINT is 0..8. */ |
| 766 | unsigned char *cmp_rule; |
| 767 | |
| 768 | /* Pointer to an array of x-axis offset of left edge of glyphs |
| 769 | relative to the left of of glyph[0] except for the first element |
| 770 | which is the absolute offset from the left edge of overall glyph. |
| 771 | The actual pixel offset should be calculated by multiplying each |
| 772 | frame's one column width by this value: |
| 773 | (i.e. FONT_WIDTH (f->output_data.x->font) * col_offset[N]). */ |
| 774 | float *col_offset; |
| 775 | |
| 776 | /* Work slot used by `dumpglyphs' (xterm.c). */ |
| 777 | int face_work; |
| 778 | }; |
| 779 | |
| 780 | /* Table of pointers to the structure `cmpchar_info' indexed by |
| 781 | CMPCHAR-ID. */ |
| 782 | extern struct cmpchar_info **cmpchar_table; |
| 783 | /* Number of the current composite characters. */ |
| 784 | extern int n_cmpchars; |
| 785 | |
| 786 | /* This is the maximum length of multi-byte form. */ |
| 787 | #define MAX_LENGTH_OF_MULTI_BYTE_FORM (MAX_COMPONENT_COUNT * 6) |
| 788 | |
| 789 | /* Maximum character code currently used. */ |
| 790 | #define MAX_CHAR (MIN_CHAR_COMPOSITION + n_cmpchars) |
| 791 | |
| 792 | extern void invalid_character P_ ((int)); |
| 793 | |
| 794 | extern int unify_char P_ ((Lisp_Object, int, int, int, int)); |
| 795 | extern int split_non_ascii_string P_ ((const unsigned char *, int, int *, |
| 796 | unsigned char *, unsigned char *)); |
| 797 | extern int string_to_non_ascii_char P_ ((const unsigned char *, int, int *)); |
| 798 | extern int non_ascii_char_to_string P_ ((int, unsigned char *, unsigned char **)); |
| 799 | extern int multibyte_form_length P_ ((const unsigned char *, int)); |
| 800 | extern int str_cmpchar_id P_ ((const unsigned char *, int)); |
| 801 | extern int get_charset_id P_ ((Lisp_Object)); |
| 802 | extern int cmpchar_component P_ ((unsigned int, unsigned int)); |
| 803 | extern int find_charset_in_str P_ ((unsigned char *, int, int *, Lisp_Object)); |
| 804 | extern int strwidth P_ ((unsigned char *, int)); |
| 805 | |
| 806 | extern Lisp_Object Vcharacter_unification_table_vector; |
| 807 | #define UNIFICATION_ID_TABLE(id) \ |
| 808 | (XCONS(XVECTOR(Vcharacter_unification_table_vector)->contents[(id)])->cdr) |
| 809 | |
| 810 | /* Copy LEN bytes from FROM to TO. This macro should be used only |
| 811 | when a caller knows that LEN is short and the obvious copy loop is |
| 812 | faster than calling bcopy which has some overhead. */ |
| 813 | |
| 814 | #define BCOPY_SHORT(from, to, len) \ |
| 815 | do { \ |
| 816 | int i = len; \ |
| 817 | unsigined char *from_p = from, *to_p = to; \ |
| 818 | while (i--) *from_p++ = *to_p++; \ |
| 819 | } while (0) |
| 820 | |
| 821 | #endif /* _CHARSET_H */ |